WOW! I don't envy you at all!!! This is the hard part! My cats pretty much except anything that comes along. I think they are just so used to it! I'm referring to the males when I say that. My girls are NASTY when it comes to anybody new! They are loaded with catatude!! The poor newbies usually get hissed at, growled at, and smacked around a bit before they seem to find their place. Two of my three girls still growl and smack anybody that gets in their space. Maggie Sue is my worst one! She is so loving to me, but boy oh boy, any kitty that gets within range is smacked! I've given up fussing at her for it because she is never going to stop. So everyone knows to stay out of paws reach of her. It just worked itself out in the end. They all got smacked enough to know she is a BAD kitty! Occasionally the two nasty girls meet up and have a knock down drag out fight. Fortunately it doesn't last too long and rank is somehow determined. If your guy is a very relaxed cat then this may be how it works out. He will get swatted enough to realize that he just needs to stay out of her space. They usually come to some kind of an agreement. It is tough to watch but no matter how much you intervene they still do it their way!!
I know it sounds awful, but really, my cats are happy and seem well adjusted. Maggie just growls alot and throws her weight around! They just give her what she wants and life is great! Girls are just loaded with TUDE!
Don't worry, it will somehow work out in the end. Connor may get a few bumps and I hope nothing too serious. She just needs to make sure that Connor learns the ropes and HER rules and life will be great!!
Good luck and don't worry...a few months from now everything will be perfectly normal. As normal as life can be with cats!!